title: Unravelling complex spectra of a simple molecule: REMPI study of the 420 nm band system of KRb.
abstract: Complex spectra of the KRb 420 nm system are analyzed by mass-resolved resonance enhanced two-photon ionization in a cold molecular beam. Vibronic structures of three singlet-singlet (4(1)Π, 7(1)Σ(+), and 5(1)Π←X(1)Σ(+)) transitions were identified for the first time. By comparing with highly accurate ab initio calculations, we assigned the singlet excited electronic states, and determined their electronic term values and vibrational constants. Weak singlet-triplet transitions were observed and identified as the 5(3)Π(0(+))←X(1)Σ(+) transitions by the homogeneous perturbation selection rule.
authors.affiliation: Department of Chemistry, Mokpo National University, Muan-gun, Jeonnam 534-729, Korea.
authors.forename: Yonghoon
authors.initials: Y
authors.lastname: Lee
authors.forename: Youngjee
authors.initials: Y
authors.lastname: Yoon
authors.forename: Jin-Tae
authors.initials: JT
authors.lastname: Kim
authors.forename: Sungyul
authors.initials: S
authors.lastname: Lee
authors.forename: Bongsoo
authors.initials: B
authors.lastname: Kim